NOMA Power Multiplexing for Wireless Capacity
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Solution Overview
Problem
Conventional orthogonal multiple access (OMA) technologies in wireless systems, such as 3G and 4G, face challenges in meeting the increasing demand for mobile data traffic due to their limitations in resource allocation and interference management.
Innovation Solution
The implementation of non-orthogonal multiple access (NOMA) systems, which enable multiple users to share the same frequency and time resources through smart power allocation at the transmitter and advanced processing at the receiver, allowing for efficient decoding of power multiplexed data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If orthogonal multiple access (OMA) techniques are used to transmit to multiple user equipments, then each user receives full power but split bandwidth, but the system cannot meet the exponentially increasing mobile data traffic demands
Solution Approach 1:
The patent merges multiple users' data signals into a single power multiplexed signal for transmission over the same frequency and time resources. The transmitter combines data signals from multiple UEs with different channel gains using non-orthogonal power allocation, allowing simultaneous transmission without requiring separate orthogonal resources, thereby exponentially increasing system capacity
Solution Approach 2:
The patent transitions from orthogonal resource allocation (frequency, time, code dimensions) to power domain multiplexing. By adding the power dimension as a new resource allocation dimension, the system can serve multiple users simultaneously on the same time-frequency resources with different power levels, resolving the capacity limitation of traditional OMA
2Productivity
If non-orthogonal power multiplexed data signals are transmitted to multiple UEs, then throughput increases by 30%, but advanced processing is required at the receiver for decoding
Solution Approach 1:
The transmitter performs preliminary power allocation and signal combination before transmission. By pre-configuring the power multiplexing ratios based on UE channel gains and performing signal combination at the transmitter, the receiver's decoding complexity is reduced compared to general non-orthogonal schemes, as the transmitter prepares the signal structure in advance
Solution Approach 2:
The system uses feedback mechanisms where UEs report channel state information and the base station adjusts power allocation accordingly. This feedback loop enables the transmitter to optimize power multiplexing ratios based on current channel conditions, improving throughput while managing receiver complexity through adaptive configuration
3Adaptability or versatility
If OMA techniques split bandwidth among multiple users, then interference is managed through orthogonality, but the system lacks adaptability to handle increasing data traffic demands
Solution Approach 1:
The patent implements dynamic power allocation where the power multiplexing ratios are adjusted in real-time based on UE channel conditions, traffic demands, and quality of service requirements. This dynamic adaptation allows the system to flexibly respond to changing traffic patterns and user requirements, significantly improving both adaptability and data traffic handling capacity compared to static OMA allocation
Data Source
AI summary
Apparatuses and methods for Non-Orthogonal Multiple Access (NOMA) communication are discussed. An example Evolved NodeB (eNB) includes a memory, a processor, and a transmitter circuit. The processor evaluates an orthogonal multiple access (OMA) metric and a NOMA metric, generates a protocol instruction that indicates an OMA transmission or a NOMA transmission based on the metrics, and determines a first modulation and coding scheme (MCS) for a first UE and a second MCS for a second UE. The transmitter circuit receives the protocol instruction and transmits a first data signal and a first downlink control information (DCI) message associated with the first UE, and a second data signal and a second DCI message associated with the second UE. When the protocol instruction indicates NOMA transmission, the data signals are power multiplexed, the DCI messages indicate the data signals are transmitted via NOMA, and the first DCI message indicates the second MCS.